应用化学2020，Vol.37Issue(8)：939-951,13.DOI:10.11944/j.issn.1000-0518.2020.08.200044
同型异质表面修饰提高La2 NiO4+δ 阴极的电催化活性
Improving the Electrocatalytic Activity of La2 NiO4 +δ Cathode by Surface Modification with Conformal Heterojunction
摘要
Abstract
Tuning the existing cathode surface to construct a hetero-interface configuration has been widely applied to improve its oxygen reduction reaction (ORR) activity.Here we report our findings on effective acceleration of the ORR kinetics of La2 NiO4 +δ ( LNO) cathode by conformal Pr2 NiO4 +δ ( PNO) modification.Meanwhile, the mechanism of the surface modification on ORR activity is revealed.Firstly, a highly active (110) plane for oxygen reduction emerges under LNO deposition.Secondly, the PNO modified layer with ～5 nm thick displays the smallest polarization resistance, which is 21 times less than that of LNO ( ～5 nm) referenced cathode.Meanwhile, PNO ( ～5 nm) heterojunction exhibits an alerted ORR kinetics because of different oxygen defect chemistries of the top layer, in which the porous LNO backbone provides a pathway to favorably transport both of oxygen ions and electrons, while the PNO decorating offers rich surface oxygen defects to further enhance the ORR activity.关键词
固体氧化物燃料电池/阴极薄膜/表面改性/同型异质结/氧还原反应Key words
solid oxide fuel cell/cathode film/surface modification/conformal heterojunction/oxygen reduction reaction activity分类
化学化工引用本文复制引用
魏振业,孟君玲,王浩聪,张文文,刘孝娟,孟健..同型异质表面修饰提高La2 NiO4+δ 阴极的电催化活性[J].应用化学,2020,37(8):939-951,13.基金项目
国家自然科学基金(21571174,21590794)和吉林省自然科学基金(20190201106JC)资助 Supported by the National Natural Science Foundation of China ( No.21571174, No.21590794 ), and the Provincial Natural Science Foundation of Jilin(No.20190201106JC) （21571174,21590794）
